Document Details


Title:
RAPID DISSOLUTION OF LARGE SOIL SAMPLES FOR 239 PLUTONIUM + 241 AMERICIUM ANALYSIS ( PAPER PRESENTED AT 17TH ANNUAL BIO-ASSAY + ANALYTICAL CHEMISTRY MEETING, BOULDER, CO., OCTOBER 13-14, 1971 )
Subject Terms:
SOILS; CHEMICAL ANALYSIS; PROCEDURES; PLUTONIUM 239; STRONTIUM 90; DATA; ACTIVITY LEVELS; AMERICIUM 241; RESEARCH PROGRAMS; ALPHA DETECTION; AMERICIUM; AMERICIUM 243; CHEMISTRY; DIAGRAMS; GAMMA SPECTROSCOPY; MAN; NAEG COLLECTION; NUCLEAR WEAPONS; PARTICLE SIZE; PARTICLES; PLUTONIUM 236; PLUTONIUM 238; PLUTONIUM 240; PLUTONIUM 241; RADIOCHEMICAL ANALYSIS; SAMPLING; SILICON; STANDARDS; WATER
Document Location:
Location - NNSA/NSO Nuclear Testing Archive Address - P.O. Box 98521 City - Las Vegas State - NV Zip - 89193-8521 Phone - (702)794-5106 Fax - (702)862-4240 Email - CIC@NV.DOE.GOV
Document Type:
REPORT
Publication Date:
1971 Oct 14
Declassification Status:
Never classified
Document Pages:
0003
Accession Number:
NV0051244
Document Number(s):
TLW6102
Originating Research Org.:
TRAPELO-DIVISION OF LABORATORY FOR ELECTRONICS (LF
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
LARGE SIZED ALIQUOTS OF SOIL ARE REQUIRED IN MANY ANALYSES FOR PLUTONI UM 238 OR 239, 240 PLUTONIUM AND/OR 241 AMERICIUM. IN SOME CASES, LAR GE ALIQUOTS ARE REQUIRED TO ACHIEVE DESIRED ANALYTICAL PRECISION IN LO W ACTIVITY SAMPLES. IN OTHER CASES, PLUTONIUM PARTICLE SIZE DISTRIBUTI ONS AND RESULTING SAMPLE INHOMOGENIETY REQUIRE LARGE ALIQUOTS. PRESENT LY, THERE ARE A NUMBER OF LEACHING METHODS FOR THIS PURPOSE. HOWEVER, IF THE CHEMICAL FORM OF PLUTONIUM IN THE SOIL IS SUCH THAT PLUTONIUM I S NOT LEACHABLE BY PROVEN TECHNIQUES, THEN THE SAMPLE MUST BE COMPLETE LY DISSOLVED FOR ACCURATE ANALYSIS. A METHOD HAS BEEN DEVELOPED BY THI S LABORATORY FOR RAPID DISSOLUTION OF SOIL ALIQUOTS RANGING UP TO 100 GRAMS DRY WEIGHT. THE SOIL IS CONTACTED WITH EXCESS HYDROFLUORIC ACID AND HEATED IN THE PRESENCE OF ADDED 236 PLUTONIUM AND 243 AMERICIUM TR ACERS. FURTHER TREATMENT WITH HF, FUMING NITRIC ACID AND HYDROCHLORIC ACID RESULTS IN AN ESSENTIALLY CLEAR SOLUTION. THE SOLUTION IS CONCENT RATED BY BOILING. ANY INSOLUBLE MATERIAL IS FILTERED AND TREATED SEPAR ATELY BY IGNITION AND A SEQUENCE OF ACID TREATMENTS RESULTING IN A FIN AL CLEAR NITRIC ACID SOLUTION. WATER IS ADDED TO HYDROLYZE ANY RESIDUA L SILICA. THE SOLUTION IS FILTERED AND THE FILTRATES ARE COMBINED. PLU TONIUM AND AMERICIUM ARE ISOLATED BY STANDARD METHODS. AT TRAPELO, A S YSTEM OF ANALYSIS IS AVAILABLE FOR ISOTLATING PLUTONIUM AND AMERICIUM FROM A VARIETY OF MATRICES. ANION EXCHANGE PURIFICATION, EFFICIENT AND RAPID ELECTRODEPOSITION OF PLUTONIUM OR AMERICIUM, FOLLOWED BY ALPHA SPECTROSCOPY ARE USED. SAMPLE DISSOLUTION AND PURIFICATION TIME, WHICH IS OFTEN RATE DETERMINING IN THIS TYPE OF ANALYSIS, HAS BEEN REDUCED SUCH THAT A NUMBER OF 100-GRAM SAMPLES CAN BE PROCESSED THROUGH THE CH EMICAL SCHEME IN TWO DAYS. TRACER RECOVERIES ARE IN THE 70 TO 80 PERCE NT RANGE.


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